US 2019/0381424 A1Published application

Continuous process and equipment for the production of oxidizing gas containing 39% o2 and 61% n2 by weight, with n2 having a purity level between 95% and 98%

OwnerFrancisco Jose JOSÉ DUARTE VIEIRAinventor

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Abstract

The object of this patent is aimed at the production of OXIDIZING GAS CONTAINING 39% O2 AND 61% N2 BY WEIGHT, WITH N2 HAVING A PURITY LEVEL BETWEEN 95% AND 98%, whereby the water that will be deaerated is previously aerated at temperatures ranging from ambient down to 0° C., under pressures between 20.6 and 31 atm, only enough to dissolve all the volume of O2 in the air that is compressed upon it, along with the portion of N2 of the air, whose capture cannot be dissociated from the process. Afterwards, part of the air is recovered at the top of the deaeration tank, in the form of oxidizing gas, containing 39% O2 and 61% N2 by weight, with N2, which was originally part of the compressed air and was not solubilized in the water, being collected at the top of the aeration or gasification tank showing a purity level between 95% and 98%. 2nd—unlike the State of the Art, which mandatorily requires high water temperature, up to its boiling point, the process degasification, object of the present invention, may be conducted by the preferred embodiment of its pieces of equipment simply by reducing degasification pressure in the degasification tank down to a little bit less than the atmospheric pressure to obtain the same oxidizing gas, and, following degasification, the process water keeps about 20 mg of air, per liter of water, dissolved in itself and, therefore, cannot be used as totally deaerated water. 3—degasification may also be carried out by equipment as formed in the first construction variant of the object of this patent by reducing pressure and, at the same time, increasing the temperature, or sending it, in both embodiments, to the equipment, pre-existing in certain industries, which is used to fully deaerate water and, in these cases, produce the oxidizing gas and fully deaerated water.

“CONTINUOUS PROCESS FOR THE PRODUCTION OF OXIDIZING GAS CONTAINING 39% O2 AND 61% N2 BY WEIGHT, WITH N2 HAVING A PURITY LEVEL BETWEEN 95% AND 98%”, carried out by compressing air over water in a three-step sequence that produces an oxidizing gas of 39% O2 and 61% N2 by weight in a single process and if the gas thus produced is reprocessed by the same three stages and the same equipment and a reprocessing gas is obtained with an O2 content of more than 39% by weight and also N2 with a purity level of 95% to 98%, where, in the case in which all three steps of this process are carried out at room temperature, partially deaerated water is recycled and the only byproducts in the process are oxidizing gas and N2 and, when the third step of this process is carried out by raising the temperature to 85° C. and, at the same time, lowering the pressure to 0.5 atmospheres, completely deaerated water can be obtained, in which case the completely deaerated water leaves the Process as a byproduct, being replaced by a new volume of Process water, characterized by:

1st Step. Water gasification—gasify the water by compressing atmospheric air over it at temperatures that may range from slightly above its solidification temperature and possibly lower than its boiling point in variable pressures and just enough to solubilize all the O2 in the air in Process water at a temperature at which the Process is carried out, between 20.6 (±5%) atmospheres at 0° C. and 31 (±5%) atmospheres at 25° C., as the proportions of air and water may vary with the mixture of gasified water and the gas being sent at the same gasification temperature and pressure to a gasification tank;
2nd step. Nitrogen Removal—carry out the continuous removal of unsolubilized N2 by keeping the processing fluid at the same pressure and the same temperature as those used in the previous process step at the same time it carries out the continuous removal of carbonated water;
3rd Step. Water degassing—send the carbonated water located at the bottom of the gasification tank, at the Process pressure and temperature, to the degassing tank in which the pressure over it is reduced to atmospheric pressure and the oxidizing gas separates from the water in which it was dissolved under pressure in the previous two Process steps.

Abstract

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